fixed to CAutomobile and friends

src/math/math.cpp

@@ -59,6 +59,12 @@ CMatrix::RotateX(float x)
 	Rotate(x, 0.0f, 0.0f);
 }
 
+void
+CMatrix::RotateY(float y)
+{
+	Rotate(0.0f, y, 0.0f);
+}
+
 void
 CMatrix::RotateZ(float z)
 {